{"record":{"id":"46582bfd65ce9e7c","repo":"nautechsystems/nautilus_trader","slug":"buy-quote-amount-exceeds-the-configured-quote-s","errorCode":null,"errorMessage":"BUY quote amount {} exceeds the configured quote-spend maximum {} for {} -> {}","messagePattern":"BUY quote amount (.+?) exceeds the configured quote-spend maximum (.+?) for (.+?) -> (.+?)","errorType":"validation","errorClass":"anyhow::Error","httpStatus":null,"severity":"error","filePath":"crates/adapters/blockchain/src/execution/client.rs","lineNumber":4100,"sourceCode":"        \"Independent swap quote returned zero\"\n    );\n    let base_amount =\n        quantity_to_raw_amount(plan.order.quantity(), plan.pool.get_base_token().decimals)?;\n    let slippage_bps = plan.slippage_bps;\n    match plan.order.order_side() {\n        OrderSide::Sell => Ok((\n            base_amount,\n            derive_min_amount_out(quote.amount, slippage_bps)?,\n        )),\n        OrderSide::Buy => {\n            let ceiling = plan.quote_spend_ceiling.ok_or_else(|| {\n                anyhow::anyhow!(\n                    \"No quote spend ceiling for BUY token pair {} -> {}\",\n                    plan.token_in,\n                    plan.token_out\n                )\n            })?;\n            anyhow::ensure!(\n                quote.amount <= ceiling.max_amount,\n                \"BUY quote amount {} exceeds the configured quote-spend maximum {} for {} -> {}\",\n                quote.amount,\n                ceiling.max_amount,\n                plan.token_in,\n                plan.token_out\n            );\n            Ok((\n                quote.amount,\n                derive_min_amount_out(base_amount, slippage_bps)?,\n            ))\n        }\n    }\n}\n\nfn validate_manifest_pool(\n    plan: &SwapPlan,\n    manifest: &BlockchainDeploymentManifest,","sourceCodeStart":4082,"sourceCodeEnd":4118,"githubUrl":"https://github.com/nautechsystems/nautilus_trader/blob/18893faf8b356be3320add8de2f861b0b647cf06/crates/adapters/blockchain/src/execution/client.rs#L4082-L4118","documentation":"In `verified_swap_amounts` (crates/adapters/blockchain/src/execution/client.rs:4100), once a BUY order's quote spend ceiling is present, the independently quoted amount of the quote token to spend must not exceed `ceiling.max_amount`. This is a risk control: it prevents the engine from spending more quote token than the configured maximum to fill a BUY.","triggerScenarios":"An independent QuoterV2 quote for an ExactOutput BUY returns quote.amount greater than the configured quote_spend_ceiling.max_amount — the desired base quantity is expensive relative to the cap, price moved, or the ceiling was configured too low for the order size.","commonSituations":"Operator configured a spend cap sized for small orders but submits a large BUY; volatile market makes the same base quantity cost more quote token than the cap; a stale ceiling reused from another network/token pair; decimal mistakes making max_amount far smaller than intended.","solutions":["Raise quote_spend_ceiling.max_amount to cover realistic quoted costs for the order size, then retry.","Reduce the BUY order quantity so its quoted spend fits within the existing cap.","Recheck quote-token decimals: max_amount is in raw (smallest) units; a decimal misconfiguration makes the cap appear exceeded.","Verify the quote is taken at the current block; a stale block can inflate the quoted amount."],"exampleFix":"// before: cap too small for the order (6-decimal USDC, raw units)\nquote_spend_ceiling: Some(QuoteSpendCeiling { max_amount: U256::from(100_000_000u64) }), // 100 raw units\n// after: cap sized correctly in raw quote-token units\nquote_spend_ceiling: Some(QuoteSpendCeiling { max_amount: U256::from(500_000_000_000u64) }), // 500k USDC raw","handlingStrategy":"validation","validationCode":"let estimate = client.quote(plan).await?;\nif estimate.amount > ceiling.max_amount {\n    return Err(\"order spend exceeds configured quote-spend maximum\");\n}","typeGuard":"fn within_ceiling(q: &UniswapV3Quote, c: &QuoteSpendCeiling) -> bool {\n    q.amount <= c.max_amount\n}","tryCatchPattern":"match client.execute_swap(plan).await {\n    Err(e) if e.to_string().contains(\"exceeds the configured quote-spend maximum\") => {\n        // shrink the order or raise the cap, then retry\n    }\n    other => other?,\n}","preventionTips":["Size quote_spend_ceiling.max_amount in raw quote-token decimals, not human units.","Stress-test BUY plans at adverse prices to confirm the cap accommodates realistic quotes.","Alert/log when quotes approach (e.g. >90% of) the ceiling so operators can raise it.","Keep ceiling config per token pair/environment to avoid cross-environment caps."],"tags":["blockchain","risk-limit","slippage","buy-order"],"backgroundTag":"value-out-of-range","analyzedSha":"18893faf8b356be3320add8de2f861b0b647cf06","analyzedAt":"2026-09-08T20:49:34.690Z","contentChangedAt":"2026-09-08T20:49:34.690Z","schemaVersion":2},"datasetVersion":"2026-09-14T00:17:10.932Z"}